US20230407202A1 - Lubricating oil composition, method for using lubricating oil composition, and method for producing lubricating oil composition - Google Patents

Lubricating oil composition, method for using lubricating oil composition, and method for producing lubricating oil composition Download PDF

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US20230407202A1
US20230407202A1 US18/251,760 US202118251760A US2023407202A1 US 20230407202 A1 US20230407202 A1 US 20230407202A1 US 202118251760 A US202118251760 A US 202118251760A US 2023407202 A1 US2023407202 A1 US 2023407202A1
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Prior art keywords
rust inhibitor
mass
lubricating oil
rust
oil composition
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Tokue Sato
Kenji Goto
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Idemitsu Kosan Co Ltd
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Idemitsu Kosan Co Ltd
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Assigned to IDEMITSU KOSAN CO.,LTD. reassignment IDEMITSU KOSAN CO.,LTD. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: SATO, TOKUE, GOTO, KENJI
Publication of US20230407202A1 publication Critical patent/US20230407202A1/en
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    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M171/00—Lubricating compositions characterised by purely physical criteria, e.g. containing as base-material, thickener or additive, ingredients which are characterised exclusively by their numerically specified physical properties, i.e. containing ingredients which are physically well-defined but for which the chemical nature is either unspecified or only very vaguely indicated
    • C10M171/001—Electrorheological fluids; smart fluids
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M169/00—Lubricating compositions characterised by containing as components a mixture of at least two types of ingredient selected from base-materials, thickeners or additives, covered by the preceding groups, each of these compounds being essential
    • C10M169/04—Mixtures of base-materials and additives
    • C10M169/044—Mixtures of base-materials and additives the additives being a mixture of non-macromolecular and macromolecular compounds
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M129/00—Lubricating compositions characterised by the additive being an organic non-macromolecular compound containing oxygen
    • C10M129/02—Lubricating compositions characterised by the additive being an organic non-macromolecular compound containing oxygen having a carbon chain of less than 30 atoms
    • C10M129/04—Hydroxy compounds
    • C10M129/10—Hydroxy compounds having hydroxy groups bound to a carbon atom of a six-membered aromatic ring
    • C—CHEMISTRY; METALLURGY
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    • C10M129/00—Lubricating compositions characterised by the additive being an organic non-macromolecular compound containing oxygen
    • C10M129/02—Lubricating compositions characterised by the additive being an organic non-macromolecular compound containing oxygen having a carbon chain of less than 30 atoms
    • C10M129/26—Carboxylic acids; Salts thereof
    • C10M129/28—Carboxylic acids; Salts thereof having carboxyl groups bound to acyclic or cycloaliphatic carbon atoms
    • C10M129/38—Carboxylic acids; Salts thereof having carboxyl groups bound to acyclic or cycloaliphatic carbon atoms having 8 or more carbon atoms
    • C10M129/40—Carboxylic acids; Salts thereof having carboxyl groups bound to acyclic or cycloaliphatic carbon atoms having 8 or more carbon atoms monocarboxylic
    • C—CHEMISTRY; METALLURGY
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    • C10M129/02—Lubricating compositions characterised by the additive being an organic non-macromolecular compound containing oxygen having a carbon chain of less than 30 atoms
    • C10M129/68—Esters
    • C10M129/74—Esters of polyhydroxy compounds
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    • C10M133/00—Lubricating compositions characterised by the additive being an organic non-macromolecular compound containing nitrogen
    • C10M133/02—Lubricating compositions characterised by the additive being an organic non-macromolecular compound containing nitrogen having a carbon chain of less than 30 atoms
    • C10M133/04—Amines, e.g. polyalkylene polyamines; Quaternary amines
    • C10M133/06—Amines, e.g. polyalkylene polyamines; Quaternary amines having amino groups bound to acyclic or cycloaliphatic carbon atoms
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    • C10M133/38—Heterocyclic nitrogen compounds
    • C10M133/40—Six-membered ring containing nitrogen and carbon only
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    • C10M137/02—Lubricating compositions characterised by the additive being an organic non-macromolecular compound containing phosphorus having no phosphorus-to-carbon bond
    • C10M137/04—Phosphate esters
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    • C10M141/10—Lubricating compositions characterised by the additive being a mixture of two or more compounds covered by more than one of the main groups C10M125/00 - C10M139/00, each of these compounds being essential at least one of them being an organic phosphorus-containing compound
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    • C10M155/02—Monomer containing silicon
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    • C10M157/08—Lubricating compositions characterised by the additive being a mixture of two or more macromolecular compounds covered by more than one of the main groups C10M143/00 - C10M155/00, each of these compounds being essential at least one of them being a phosphorus-containing compound
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    • C10M161/00—Lubricating compositions characterised by the additive being a mixture of a macromolecular compound and a non-macromolecular compound, each of these compounds being essential
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    • C10M2203/00—Organic non-macromolecular hydrocarbon compounds and hydrocarbon fractions as ingredients in lubricant compositions
    • C10M2203/003—Organic non-macromolecular hydrocarbon compounds and hydrocarbon fractions as ingredients in lubricant compositions used as base material
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    • C10M2207/023—Hydroxy compounds having hydroxy groups bound to carbon atoms of six-membered aromatic rings
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    • C10M2207/026—Hydroxy compounds having hydroxy groups bound to carbon atoms of six-membered aromatic rings with tertiary alkyl groups
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    • C10M2207/125—Carboxylix acids; Neutral salts thereof having carboxyl groups bound to acyclic or cycloaliphatic carbon atoms having hydrocarbon chains of eight up to twenty-nine carbon atoms, i.e. fatty acids
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    • C10M2215/04—Amines, e.g. polyalkylene polyamines; Quaternary amines having amino groups bound to acyclic or cycloaliphatic carbon atoms
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    • C10M2215/08—Amides
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    • C10N2030/06—Oiliness; Film-strength; Anti-wear; Resistance to extreme pressure
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    • C10N2040/00—Specified use or application for which the lubricating composition is intended
    • C10N2040/135—Steam engines or turbines

Definitions

  • PTL 1 proposes a lubricating oil composition containing a hydrocarbon-based oil selected from a mineral oil and a synthetic oil containing 0.008 to 0.04% by mass of a sarcosine derivative, 0.01 to 0.07% by mass of an alkenylsuccinate, 0.1 to 3.0% by mass of an amine-based antioxidant, and 0.1 to 3.0% by mass of a phenol-based antioxidant, based on the total amount of the composition.
  • the sarcosine derivative and the alkenylsuccinate are added as a rust inhibitor.
  • the present inventors have made earnest investigations on lubricating oil compositions used in equipments that may be contaminated with water or steam, by using various base oils from the standpoint of the diversification of the raw material procurement, and the like. As a result, it has been found that there are base oils, although in a few cases, that cannot sufficiently secure the rust inhibiting capability even by using a succinate alone, which has been ordinarily known as a rust inhibitor.
  • a lubricating oil composition having an excellent rust inhibiting capability even containing a base oil containing a polar substance that has a function significantly deteriorating the rust inhibiting capability, and a use method and a production method of the lubricating oil composition can be provided.
  • the lubricating oil composition of the present invention contains a base oil (A) and a rust inhibitor (B).
  • the rust inhibitor (B) is one or more kind selected from the group consisting of a first rust inhibitor (B1), a second rust inhibitor (B2), a third rust inhibitor (B3), and a fourth rust inhibitor (B4).
  • the first rust inhibitor (B1) a combination of a succinate (B1-1) and a sorbitan fatty acid ester (B1-2)
  • the second rust inhibitor (B2) a carboxylic acid amide (B2-1)
  • the third rust inhibitor (B3) a neutral alkyl phosphate (B3-1)
  • the fourth rust inhibitor (B4) a combination of a fatty acid having 12 or more carbon atoms (B4-1) and a primary amine (B4-2)
  • the contents of the first rust inhibitor (B1), the second rust inhibitor (B2), the third rust inhibitor (B3), and the fourth rust inhibitor (B4) satisfy the following condition ( ⁇ ) based on the total amount of the lubricating oil composition.
  • the second rust inhibitor (B2) more than 0.05% by mass and 0.5% by mass or less
  • the third rust inhibitor (B3) 0.005% by mass or more and less than 0.05% by mass
  • the fourth rust inhibitor (B4) more than 0.05% by mass and less than 0.20% by mass
  • the present inventors have made the earnest investigations for solving the problem, and as a result, have found the condition (a) as an indicator that identifies the base oil containing a polar substance that has a function significantly deteriorating the rust inhibiting capability.
  • the present inventors have confirmed the following items (1) and (2) in the process of various investigations. Therefore, it is apparent that the substance that has a function significantly deteriorating the rust inhibiting capability is a polar substance, and the polar substance significantly deteriorates the rust inhibiting capability of the lubricating oil composition.
  • a base oil satisfying the condition ( ⁇ ) is subjected to a white clay treatment to extract the polar substance, and the polar substance thus extracted is added to a base oil not satisfying the condition ( ⁇ ) to prepare a base oil satisfying the condition ( ⁇ ).
  • a lubricating oil composition is prepared by using the base oil, and investigated for the rust inhibiting capability, and it has been found that occurrence of rust is accelerated.
  • a base oil satisfying the condition ( ⁇ ) is subjected to a white clay treatment to remove the polar substance from the base oil to prepare a base oil not satisfying the condition ( ⁇ ).
  • a lubricating oil composition is prepared by using the base oil, and as a result, it has been found that occurrence of rust is suppressed.
  • the present inventors have then made the earnest investigations for securing an excellent rust inhibiting capability of the lubricating oil composition containing a base oil satisfying the condition ( ⁇ ).
  • a combination of a succinate and a sorbitan fatty acid ester (first rust inhibitor (B1)), a carboxylic acid amide (second rust inhibitor (B2)), a fatty acid phosphate (third rust inhibitor (B3)), or a combination of a fatty acid having 12 or more carbon atoms (B4-1) and a primary amine (B4-2) (fourth rust inhibitor (B4)) that is regulated to a content satisfying the condition (3)
  • first rust inhibitor (B1)) a carboxylic acid amide
  • second rust inhibitor (B2) a fatty acid phosphate
  • B3 third rust inhibitor
  • the lubricating oil composition of one embodiment of the present invention may not contain a component other than the component (A) and the component (B), but preferably further contains one or more kind of an additive selected from the group consisting of an antioxidant (C), an anti-wear agent (D), and an anti-foaming agent (E).
  • an antioxidant C
  • an anti-wear agent D
  • an anti-foaming agent E
  • the “antioxidant (C)”, the “anti-wear agent (D)”, and the “anti-foaming agent (E)” may be referred to as a “component (C)”, a “component (D)”, and a “component (E)”, respectively.
  • the base oil (A) satisfies the following condition ( ⁇ ).
  • the number of carbon atoms of the polar substance can be more specifically narrowed down into the following ranges ( ⁇ 1) to ( ⁇ 3). Therefore, the range of the number of carbon atoms where the first peak exists can also be narrowed down into the following ranges ( ⁇ 1) to ( ⁇ 3).
  • the gas chromatogram can be measured by employing the apparatus and the conditions shown in Examples described later.
  • the upper limit values and the lower limit values of the numerical ranges may be optionally combined.
  • the content thereof is preferably 90.0% by mass to 99.5% by mass, more preferably 95.0% by mass to 99.2% by mass, and further preferably 97.0% by mass to 99.0% by mass.
  • Any base oil that satisfies the condition ( ⁇ ) can be used as the base oil (A) with no particular limitation.
  • the measurement of a gas chromatogram measured according to ASTM D7500 with a gas chromatography distillation equipment as defined in the condition ( ⁇ ) also shows a peak detected in a range of a number of carbon atoms of 23 or more and 50 or less (which may be hereinafter referred to as a “second peak”) (see Base Oil (A) in FIG. 1 ).
  • the second peak is a peak ascribed to the one or more kind of a base oil selected from a paraffin-based mineral oil and a hydrocarbon-based oil (i.e., the major component of the base oil).
  • the intensity ratio [(first peak intensity)/(second peak intensity)] of the first peak and the second peak in the gas chromatogram is not particularly limited, and is preferably 0.50 or less, more preferably 0.40 or less, and further preferably 0.35 or less, from the standpoint of the effects of the present invention exerted by the rust inhibitor (B) and the condition ( ⁇ ).
  • the intensity ratio may be 0.10 or more, may be 0.20 or more, and may be 0.25 or more.
  • the number of carbon atoms of the second peak can be narrowed down into the following ranges ( ⁇ 1) to ( ⁇ 3).
  • the base oil (A) preferably has a high flash point from the standpoint of the safety and the handleability in storage and transportation.
  • the flash point of the base oil (A) is preferably 250° C. or more.
  • the upper limit value of the flash point of the base oil (A) is not particularly limited, and is generally 400° C. or less.
  • the flash point of the base oil (A) is a value that is measured according to JIS K2265-4:2007 (Determination of flash points, Part 4: Cleveland open cup method) by the Cleveland open-cup method.
  • the density at 15° C. of the base oil (A) is preferably 0.9000 g/cm 3 or less, more preferably 0.8500 g/cm 3 or less, and further preferably 0.8300 g/cm 3 or less, and is preferably 0.8000 g/cm 3 or more.
  • the upper limit values and the lower limit values of the numerical ranges may be optionally combined.
  • the density thereof is preferably 0.8000 g/cm 3 to 0.9000 g/cm 3 , more preferably 0.8000 g/cm 3 to 0.8500 g/cm 3 , and further preferably 0.8000 g/cm 3 to 0.8300 g/cm 3 .
  • the kinematic viscosity at 100° C. (which may be hereinafter referred to as a “100° C. kinematic viscosity”) of the base oil (A) is preferably 3.00 mm 2 /s or more, more preferably 5.00 mm 2 /s or more, and further preferably 7.50 mm 2 /s or more.
  • the 100° C. kinematic viscosity thereof is preferably 15.0 mm 2 /s or less, more preferably 10.0 mm 2 /s or less, and further preferably 9.00 mm 2 /s or less.
  • the 100° C. kinematic viscosity thereof is preferably 3.00 mm 2 /s to 15.0 mm 2 /s, more preferably 5.00 mm 2 /s to 10.0 mm 2 /s, and further preferably 7.50 mm 2 /s to 9.00 mm 2 /s.
  • the viscosity index of the base oil (A) is preferably 100 or more, more preferably 110 or more, and further preferably 120 or more, and is generally 150 or less.
  • the 100° C. kinematic viscosity and the viscosity index of the base oil (A) are values that are measured or calculated according to JIS K2283:2000.
  • the base oil (A) preferably satisfies the following condition ( ⁇ ) in addition to the condition ( ⁇ ) from the standpoint of facilitating the excellent viscosity characteristics and the preparation of the lubricating oil composition having a high flash point.
  • the lubricating oil composition of the present invention contains a rust inhibitor (B).
  • the first rust inhibitor (B1) a combination of a succinate (B1-1) and a sorbitan fatty acid ester (B1-2)
  • the second rust inhibitor (B2) a carboxylic acid amide (B2-1)
  • the third rust inhibitor (B3) a neutral alkyl phosphate (B3-1)
  • the rust inhibitor (B) is preferably one kind selected from the group consisting of the first rust inhibitor (B1), the second rust inhibitor (B2), the third rust inhibitor (B3), and the fourth rust inhibitor (B4).
  • the rust inhibitor (B) is preferably the first rust inhibitor (B1) or the second rust inhibitor (B2) from the standpoint of the achievement of the lubricating oil composition excellent in demulsibility.
  • the first rust inhibitor (B1) more than 0.02% by mass and less than 0.16% by mass
  • the fourth rust inhibitor (B4) more than 0.05% by mass and less than 0.20% by mass
  • the single use of the succinate (B1-1) cannot exert a sufficient rust inhibiting capability to the base oil (A) satisfying the condition ( ⁇ ).
  • the combination use thereof with the sorbitan fatty acid ester (B1-2) exerts an excellent rust inhibiting capability to the base oil (A) satisfying the condition ( ⁇ ).
  • the succinate (B1-1) is not particularly limited, as far as the effects of the present invention can be exerted, and one kind thereof may be used alone, or two or more kinds thereof may be used in combination.
  • the succinate (B1-1) is preferably an ester of an alkenylsuccinic acid and a polyhydric alcohol (i.e., a polyhydric alcohol alkenylsuccinate) from the standpoint of facilitating the exertion of the effects of the present invention and the standpoint of the storage stability.
  • the ester is preferably a half ester.
  • alkenylsuccinic acid constituting the polyhydric alcohol alkenylsuccinate ester examples include an alkenylsuccinic acid having preferably 8 to 28 carbon atoms, more preferably 10 to 24 carbon atoms, and further preferably 12 to 20 carbon atoms.
  • Preferred examples of the polyhydric alcohol constituting the polyhydric alcohol alkenylsuccinate include a diol and a polyol having 3 to 20 hydroxy groups.
  • diol examples include ethylene glycol, propanediol, butanediol, pentanediol, hexanediol, heptanediol, octanediol, nonanediol, decanediol, undecanediol, and dodecanediol.
  • the aliphatic hydrocarbon group constituting the diol may be a linear group or a branched group.
  • polyol having 3 to 20 hydroxy groups examples include a polyhydric alcohol, such as trimethylolethane, trimethylolpropane, trimethylolbutane, trimethylolpentane, trimethylolhexane, trimethylolheptane, di(trimethylolpropane), tri(trimethylolpropane), pentaerythritol, di(pentaerythritol), tri(pentaerythritol), glycerin, polyglycerin (dimer to icosamer of glycerin), 1,3,5-pentanetriol, sorbitol, sorbitan, a sorbitol-glycerin condensate, adonitol, arabitol, xylitol, and mannitol; a saccharide, such as xylose, arabinose, ribose, rhamnose, glucose, fructose, gal
  • the single use of the sorbitan fatty acid ester (B1-2) cannot exert a sufficient rust inhibiting capability to the base oil (A) satisfying the condition ( ⁇ ).
  • the combination use thereof with the succinate (B1-1) exerts an excellent rust inhibiting capability to the base oil (A) satisfying the condition ( ⁇ ).
  • the sorbitan fatty acid ester (B1-2) is not particularly limited, as far as the effects of the present invention can be exerted, and one kind thereof may be used alone, or two or more kinds thereof may be used in combination.
  • the sorbitan fatty acid ester (B1-2) is preferably an ester compound of sorbitan and a fatty acid having 12 or more and 30 or less carbon atoms from the standpoint of facilitating the exertion of the effects of the present invention.
  • the sorbitan fatty acid ester (B1-2) is preferably an ester compound with a fatty acid having 12 or more and 20 or less carbon atoms, more preferably an ester compound with a fatty acid having 16 or more and 20 or less carbon atoms, and further preferably sorbitan oleate, from the standpoint of facilitating the exertion of the effects of the present invention.
  • the content of the first rust inhibitor (B1) is 0.02% by mass or less or 0.16% by mass or more based on the total amount of the lubricating oil composition, a sufficient rust inhibiting capability cannot be exerted to the base oil (A) satisfying the condition ( ⁇ ).
  • the upper limit values and the lower limit values of the numerical ranges may be optionally combined.
  • the content thereof is preferably 0.03% by mass to 0.15% by mass, more preferably 0.05% by mass to 0.14% by mass, further preferably 0.07% by mass to 0.13% by mass, and still further preferably 0.08% by mass to 0.12% by mass.
  • the lubricating oil composition of one embodiment of the present invention preferably has a content ratio [(B1-1)/(B1-2)] of the succinate (B1-1) and the sorbitan fatty acid ester (B1-2) in terms of mass ratio of 0.1 or more and 5.0 or less from the standpoint of facilitating the exertion of the effects of the present invention.
  • the upper limit values and the lower limit values of the numerical ranges may be optionally combined.
  • the content ratio is preferably 0.2 to 4.0, more preferably 0.5 to 2.0, and further preferably 0.8 to 1.2.
  • the lubricating oil composition of one embodiment of the present invention preferably has a content of the succinate (B1-1) of more than 0.01% by mass, more preferably 0.02% by mass or more, further preferably 0.03% by mass or more, and still further preferably 0.04% by mass or more, based on the total amount of the lubricating oil composition, from the standpoint of facilitating the exertion of the effects of the present invention.
  • the content thereof is preferably less than 0.08% by mass, more preferably 0.07% by mass or less, and further preferably 0.06% by mass or less.
  • the upper limit values and the lower limit values of the numerical ranges may be optionally combined.
  • the content thereof is preferably more than 0.01% by mass to less than 0.08% by mass, more preferably 0.02% by mass to by mass, further preferably 0.03% by mass to 0.07% by mass, and still further preferably 0.04% by mass to 0.06% by mass.
  • the lubricating oil composition of one embodiment of the present invention preferably has a content of the sorbitan fatty acid ester (B1-2) of more than 0.01% by mass, more preferably 0.02% by mass or more, further preferably 0.03% by mass or more, and still further preferably 0.04% by mass or more, based on the total amount of the lubricating oil composition, from the standpoint of facilitating the exertion of the effects of the present invention.
  • the content thereof is preferably less than 0.08% by mass, more preferably 0.07% by mass or less, and further preferably 0.06% by mass or less.
  • the upper limit values and the lower limit values of the numerical ranges may be optionally combined.
  • the content thereof is preferably more than 0.01% by mass to less than 0.08% by mass, more preferably 0.02% by mass to by mass, further preferably 0.03% by mass to 0.07% by mass, and still further preferably 0.04% by mass to 0.06% by mass.
  • the second rust inhibitor (B2) is a carboxylic acid amide (B2-1).
  • the carboxylic acid amide (B2-1) is not particularly limited, as far as the effects of the present invention can be exerted, and one kind thereof may be used alone, or two or more kinds thereof may be used in combination.
  • the carboxylic acid amide (B2-1) is preferably a carboxylic acid amide having an acid value of 80 mgKOH/g or less from the standpoint of facilitating the exertion of the effects of the present invention.
  • the acid value is more preferably 70 mgKOH/g or less, and further preferably 65 mgKOH/g or less.
  • the lower limit value of the acid value is not particularly limited, and is generally 10 mgKOH/g or more.
  • carboxylic acid amide (B2-1) examples include carboxylic acid amides obtained through reaction of a carboxylic acid, such as caproic acid, caprylic acid, capric acid, lauric acid, myristic acid, palmitic acid, stearic acid, arachinic acid, behenic acid, lignoceric acid, zoomaric acid, oleic acid, linoleic acid, linolenic acid, gadoleic acid, erucic acid, selacholeic acid, ricinoleic acid, a hydroxystearic acid, an alkenylsuccinic anhydride, and an alkylsuccinic anhydride, with an amine (ammonia).
  • a carboxylic acid such as caproic acid, caprylic acid, capric acid, lauric acid, myristic acid, palmitic acid, stearic acid, arachinic acid, behenic acid, lignoceric acid, zoomaric acid, oleic acid
  • the carboxylic acid amide (B2-1) is also preferably a carboxylic acid alkanolamide.
  • Specific examples of the carboxylic acid alkanolamide include lauric acid diethanolamide, oleic acid diethanolamide, stearic acid diethanolamide, oleic acid monoethanolamide, oleic acid monopropanolamide, and oleic acid dipropanolamide.
  • the content of the second rust inhibitor (B2) is more than 0.05% by mass and 0.5% by mass or less based on the total amount of the lubricating oil composition as defined in the condition (6).
  • the content of the second rust inhibitor (B2) is 0.05% by mass or less or more than 0.5% by mass based on the total amount of the lubricating oil composition, a sufficient rust inhibiting capability cannot be exerted to the base oil (A) satisfying the condition ( ⁇ ).
  • the content of the second rust inhibitor (B2) defined in the condition (6) is preferably 0.06% by mass or more, more preferably 0.08% by mass or more, and further preferably 0.10% by mass or more, based on the total amount of the lubricating oil composition, from the standpoint of facilitating the further enhancement of the rust inhibiting capability and the standpoint of achieving the lubricating oil composition excellent in demulsibility.
  • the content thereof is preferably 0.40% by mass or less, more preferably 0.30% by mass or less, further preferably 0.25% by mass or less, and still further preferably 0.20% by mass or less.
  • the upper limit values and the lower limit values of the numerical ranges may be optionally combined.
  • the content thereof is preferably 0.06% by mass to 0.40% by mass, more preferably 0.08% by mass to 0.30% by mass, further preferably 0.08% by mass to 0.25% by mass, and still further preferably 0.10% by mass to 0.20% by mass.
  • the third rust inhibitor (B3) is a neutral alkyl phosphate (B3-1).
  • the neutral alkyl phosphate (B3-1) is not particularly limited, as far as the effects of the present invention can be exerted, and one kind thereof may be used alone, or two or more kinds thereof may be used in combination.
  • the neutral alkyl phosphate (B3-1) used is preferably, for example, a compound represented by the following general formula (b3-1).
  • R 1 to R 3 each independently represent an alkyl group having 3 to 14 carbon atoms.
  • alkyl groups each may be a linear group or a branched group.
  • the content of the third rust inhibitor (B3) is by mass or more and less than 0.05% by mass based on the total amount of the lubricating oil composition as defined in the condition (6).
  • the content of the third rust inhibitor (B3) is less than by mass or 0.05% by mass or more based on the total amount of the lubricating oil composition, a sufficient rust inhibiting capability cannot be exerted to the base oil (A) satisfying the condition ( ⁇ ).
  • the content of the third rust inhibitor (B3) defined in the condition (6) is preferably 0.006% by mass to 0.04% by mass, more preferably 0.01% by mass to 0.03% by mass, and further preferably by mass to 0.02% by mass, based on the total amount of the lubricating oil composition, from the standpoint of facilitating the further enhancement of the rust inhibiting capability and the standpoint of achieving the lubricating oil composition excellent in demulsibility.
  • the fourth rust inhibitor (B4) is a combination of a fatty acid having 12 or more carbon atoms (B4-1) and a primary amine (B4-2).
  • the fourth rust inhibitor (B4) contains a fatty acid having 12 or more carbon atoms (B4-1).
  • the single use of the fatty acid having 12 or more carbon atoms (B4-1) cannot exert a sufficient rust inhibiting capability to the base oil (A) satisfying the condition ( ⁇ ).
  • the combination use thereof with the primary amine (B4-2) exerts an excellent rust inhibiting capability to the base oil (A) satisfying the condition ( ⁇ ).
  • the fatty acid having 12 or more carbon atoms (B4-1) is not particularly limited, as far as the effects of the present invention can be exerted, and one kind thereof may be used alone, or two or more kinds thereof may be used in combination.
  • the fatty acid having 12 or more carbon atoms (B4-1) is preferably a fatty acid having 12 to 20 carbon atoms from the standpoint of facilitating the exertion of the effects of the present invention and the standpoint of suppressing the generation of sludge.
  • fatty acid examples include lauric acid, tridecanoic acid, myristic acid, pentadecanoic acid, palmitic acid, margaric acid, stearic acid, oleic acid, nonadecanoic acid, arachidic acid, eicosenoic acid, henicosylic acid, behenic acid, erucic acid, tricosilyc acid, and lignoceric acid.
  • the aliphatic hydrocarbon group constituting the fatty acid having 12 or more carbon atoms (B4-1) may be a linear group or a branched group.
  • the fourth rust inhibitor (B4) contains a primary amine (B4-2).
  • the single use of the primary amine (B4-2) cannot exert a sufficient rust inhibiting capability to the base oil (A) satisfying the condition ( ⁇ ).
  • the combination use thereof with the fatty acid having 12 or more carbon atoms (B4-1) exerts an excellent rust inhibiting capability to the base oil (A) satisfying the condition ( ⁇ ).
  • the primary amine (B4-2) is not particularly limited, as far as the effects of the present invention can be exerted, and one kind thereof may be used alone, or two or more kinds thereof may be used in combination.
  • the primary amine (B4-2) is preferably a primary amine having a hydrocarbon group having 3 to 20 carbon atoms, and more preferably a primary amine having a hydrocarbon group having 6 to 12 carbon atoms, from the standpoint of facilitating the exertion of the effects of the present invention and the standpoint of suppressing the generation of sludge.
  • hydrocarbon group examples include an alkyl group and an alkenyl group.
  • alkyl group examples include a hexyl group, a heptyl group, an octyl group, a nonyl group, a decyl group, an undecyl group, and a dodecyl group.
  • alkyl groups each may be a linear group or a branched group.
  • alkenyl group examples include a hexenyl group, a heptenyl group, an octenyl group, a nonenyl group, a decenyl group, an undecenyl group, and a dodecenyl group.
  • More specific examples of the primary amine (B4-2) include hexylamine, heptylamine, octylamine, nonylamine, decylamine, undecylamine, dodecylamine, hexenylamine, heptenylamine, octenylamine, nonenylamine, decenylamine, undecenylamine, and dodecenylamine.
  • the content of the fourth rust inhibitor (B4) is more than 0.05% by mass and less than 0.20% by mass based on the total amount of the lubricating oil composition as defined in the condition (6).
  • the content of the fourth rust inhibitor (B4) is 0.05% by mass or less or 0.20% by mass or more based on the total amount of the lubricating oil composition, a sufficient rust inhibiting capability cannot be exerted to the base oil (A) satisfying the condition ( ⁇ ).
  • the content of the fourth rust inhibitor (B4) defined in the condition (6) is preferably 0.06% by mass or more, more preferably 0.08% by mass or more, and further preferably 0.10% by mass or more, based on the total amount of the lubricating oil composition, from the standpoint of facilitating the further enhancement of the rust inhibiting capability and the standpoint of achieving the lubricating oil composition excellent in demulsibility.
  • the content thereof is preferably 0.19% by mass or less, more preferably 0.17% by mass or less, and further preferably 0.15% by mass or less.
  • the upper limit values and the lower limit values of the numerical ranges may be optionally combined.
  • the content thereof is preferably more than 0.05% by mass to less than 0.19% by mass, more preferably 0.07% by mass to by mass, and further preferably 0.09% by mass to 0.11% by mass.
  • the lubricating oil composition of one embodiment of the present invention may contain a rust inhibitor (B′) other than the rust inhibitor (B), but the rust inhibitor (B′) cannot exert a sufficient rust inhibiting capability to the base oil (A) satisfying the condition ( ⁇ ), and therefore the content of the rust inhibitor (B′) is preferably small.
  • the lubricating oil composition of one embodiment of the present invention preferably contains an antioxidant (C) from the standpoint of the enhancement of the oxidation stability.
  • the lubricating oil composition of one embodiment of the present invention preferably contains an anti-wear agent (D) from the standpoint of the enhancement of the wear resistance.
  • the lubricating oil composition of one embodiment of the present invention preferably contains an anti-foaming agent (E) from the standpoint of the foaming prevention of the lubricating oil composition.
  • the total content of the component (A), the component (B), and one or more kind of an additive selected from the group consisting of an antioxidant (C), an anti-wear agent (D), and an anti-foaming agent (E) is preferably 90% by mass to 100% by mass, more preferably 95% by mass to 100% by mass, and further preferably 99% by mass to 100% by mass, based on the total amount of the lubricating oil composition.
  • the antioxidant (C) used is not particularly limited, as far as the antioxidant has an effect of suppressing oxidation of the lubricating oil composition.
  • examples thereof include one or more kind selected from the group consisting of a phenol-based antioxidant and an amine-based antioxidant.
  • a phenol-based antioxidant is preferred.
  • the phenol-based antioxidant used is not particularly limited, as far as the compound contains no amino group, has a phenol structure, and has an effect of suppressing oxidation of the lubricating oil composition.
  • phenol-based antioxidant examples include a monocyclic phenol-based antioxidant and a polycyclic phenol-based antioxidant.
  • polycyclic phenol-based antioxidant examples include 4,4′-methylenebis(2,6-di-t-butylphenol), 4,4′ isopropylidenebis(2,6-di-t-butylphenol), 2,2′-methylenebis(4-methyl-6-t-butylphenol), 4,4′-bis(2,6-di-t-butylphenol), 4,4′-bis(2-methyl-6-t-butylphenol), 2,2′-methylenebis(4-ethyl-6-t-butylphenol), and 4,4′-butylidenebis(3-methyl-6-t-butylphenol).
  • the amine-based antioxidant (B) used is not particularly limited, as far as the compound has ammonia (NH 3 ), at least one hydrogen atom of which is substituted by a hydrocarbon group, and has an effect of suppressing oxidation of the lubricating oil composition.
  • naphthylamine-based compound examples include 1-naphthylamine, phenyl-1-naphthylamine, butylphenyl-1-naphthylamine, pentylphenyl-1-naphthylamine, hexylphenyl-1-naphthylamine, heptylphenyl-1-naphthylamine, octylphenyl-1-naphthylamine, nonylphenyl-1-naphthylamine, decylphenyl-1-naphthylamine, and dodecylphenyl-1-naphthylamine.
  • the anti-wear agent (D) used is not particularly limited, as far as the compound has an effect of enhancing the wear resistance.
  • the content of the anti-wear agent (D) is preferably 0.1% by mass to 0.7% by mass, more preferably 0.2% by mass to 0.6% by mass, and further preferably 0.3% by mass to 0.5% by mass, based on the total amount of the lubricating oil composition.
  • the anti-foaming agent (E) used is not particularly limited, as far as the compound exerts an effect of suppressing foaming of the lubricating oil composition.
  • examples of the anti-foaming agent (E) include a silicone-based anti-foaming agent, a fluorine-based anti-foaming agent, such as a fluorosilicone oil and a fluoroalkyl ether, and a polyacrylate-based anti-foaming agent.
  • the content of the anti-foaming agent (E) in terms of resin content is preferably 0.0001% by mass to 0.20% by mass, and more preferably 0.0005% by mass to 0.10% by mass, based on the total amount of the lubricating oil composition.
  • the lubricating oil composition of one embodiment of the present invention may contain an additional lubricating oil additive other than the rust inhibitor (B), the antioxidant (C), the anti-wear agent (D), and the anti-foaming agent (E), in such a range that does not impair the effects of the present invention.
  • Examples of the additional lubricating oil additive include an extreme pressure agent, a friction modifier, and a metal deactivator.
  • One kind of these additional lubricating oil additives may be used alone, or two or more kinds thereof may be used in combination.
  • the 100° C. kinematic viscosity of the lubricating oil composition of one embodiment of the present invention is preferably 5.0 mm 2 /s to 10.0 mm 2 /s, more preferably 6.0 mm 2 /s to 9.0 mm 2 /s, and further preferably 6.4 mm 2 /s to 8.6 mm 2 /s.
  • the viscosity index of the lubricating oil composition of one embodiment of the present invention is preferably 100 or more, more preferably 110 or more, and further preferably 120 or more.
  • the 100° C. kinematic viscosity and the viscosity index of the lubricating oil composition are values that are measured or calculated according to JIS K2283:2000.
  • the lubricating oil composition of one embodiment of the present invention preferably causes no rust in a test according to JIS K2510:1998 (Method B, artificial seawater method) shown in Examples described later.
  • the lubricating oil composition of one embodiment of the present invention has, in the water separability test according to JIS K2520:2000 shown in Examples described later, a period of time required for separation of preferably 20 minutes or less, more preferably 15 minutes or less, and further preferably 10 minutes or less.
  • the production method of the lubricating oil composition of one embodiment of the present invention may be a method for producing a lubricating oil composition, including mixing a base oil (A) and a rust inhibitor (B),
  • the lubricating oil composition of one embodiment of the present invention can be favorably applied to a lubricating oil composition used in equipments that may be contaminated with water or steam.
  • the base oils and the additives shown below were sufficiently mixed at the blending amounts (% by mass) shown in Tables 1 to 7 to prepare lubricating oil compositions.
  • a base oil having the following property values was used.
  • a mineral oil having the following property values was used.
  • the contents of the silicone-based anti-foaming agent shown in Tables 1 to 7 each are the content including the diluent oil, and the content of the silicone-based anti-foaming agent in terms of resin content is 0.001% by mass based on the total amount of the lubricating oil composition.
  • the base oil (A) and the base oil (A′) each were measured for gas chromatogram through gas chromatography distillation under the following condition.
  • the lubricating oil compositions of Examples 1 to 5 each were subjected to the water separability test according to JIS K2520:2000.
  • a value a closer to 40 mL, a value b closer to 40 mL, a value c closer to 0 mL, and a shorter value d mean an excellent demulsibility.
  • the chromatogram of the base oil (A) also has a peak (second peak) in a range of a number of carbon atoms of 23 or more and 50 or less.
  • the intensity ratio [(first peak intensity)/(second peak intensity)] of the first peak and the second peak in the chromatogram of the base oil (A) is 0.31.
  • the chromatogram of the base oil (A′) does not have a peak (first peak) in a range of a number of carbon atoms of more than 11 and less than 23, and thus does not satisfy the condition ( ⁇ ). Accordingly, it is understood that the base oil (A′) is a base oil that substantially does not contain a polar substance that has a function significantly deteriorating the rust inhibiting capability.
  • the lubricating oil compositions using the first rust inhibitor (B1) and the second rust inhibitor (B2) each exhibit a short period of time required for separation, from which it is understood that these are particularly excellent in demulsibility.

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  • Lubricants (AREA)
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